An Efficient Synthesis of 14-Aryl or Alkyl-14H-Dibenzo[a. j]Xanthenes Using Reusable HBF4-SiO2 Catalyst Under Thermal and Solvent-Free Conditions

A simple and convenient procedure for the synthesis of 14‐aryl or alkyl‐14H‐dibenzo[a. j]xanthene derivatives is described through a one‐pot condensation of β‐naphthol with various aryl or alkyl aldehydes in the presence of HBF4‐SiO2 as the catalyst under thermal and solvent‐free conditions. A simple and facile synthesis of 14‐aryl or alkyl‐14H‐dibenzo[a. j]xanthenes has been accomplished by treatment of 2‐naphthol with aryl or alkyl aldehydes under thermal and solvent‐free conditions in the presence of HBF4‐SiO2 as a catalyst.